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The Lockheed C-121 Constellation was a military transport version of the Lockheed Constellation. A total of 332 aircraft were constructed for both the United States Air Force and United States Navy for various purposes. Numerous AWACS versions were also constructed. The C-121 later saw service with smaller civilian operators until 1993.

The Lockheed EC-121 Warning Star was an airborne early warning radar surveillance aircraft version of the C-121 Constellation transport. It was designed to serve as an airborne early warning system to supplement the Distant Early Warning Line, using two large radomes, a vertical dome above and a horizontal one below the fuselage. EC-121s were also used for intelligence gathering (SIGINT).

Below is a list of Constellation airframes that survived military service.

48-609  (D-05)
48-610  (A-03)
48-613  (D-03)
48-614  (D-03)
52-3417  (S-03)
52-3418  (D-06)
52-3425  (D-13)
   53-0535  (S-03)
53-0548  (A-02)
53-0554  (D-03)
53-0555  (D-03)
53-7885  (D-03)
54-155  (D-16)
54-180  (D-06)
   137890  (D-03)
141292  (C-99)
141297  (D-12)
141309  (D-07)
141311  (D-13)
143221  (D-12)
A U.S. Navy Lockheed WV-2 Warning Star (BuNo 141310) of early warning swquadron VW-15 flies over the Edsall-class radar picket destroyer escort USS Sellstrom (DER-255) off the coast of Newfoundland, Canada, in March 1957. The WV-2 141310 disappeared on 20 February 1958 300 km north of the Azores in the Atlantic Ocean. No trace of the aircraft or the crew of 22 was ever found.
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